Mounting

To be inserted at both sides into a round duct and to be equipped with a silencer if necessary

horizontal or vertical mounting

Accessories

Stainless steel models or insulation shells available upon request

Text for tender

The constant volume control dampers shall be of the circular type, made of galvanized steel and to be inserted at both ends in to the ductwork. They shall contain a self regulating valve, piston and stainless steel springand shall have an adjustable air volume. The valves shall be used for a pressure range between 40 and 500Pa.

Cairox Type VRS-LP

The constant volume control dampers shall be of the circular type, made of galvanized steel and to be inserted at both ends in to the ductwork. They shall contain a self regulating valve, piston and stainless steel springand shall have an adjustable air volume. The valves shall be used for a pressure range between 40 and 500Pa.

Cairox Type VRS-LP

Order example

VRS-LP, 125

Explanation

VRS-LP= Type of constant air valve

125 = Duct diameter

Other available products

Version ATEX available upon request

Dimensions

VRS-LP

ØD [mm]

L1 [mm]

L2 [mm]

H [mm]

80

79

140

40

70

100

99

170

40

70

125

124

170

40

70

160

159

240

40

70

200

199

240

40

70

250

249

240

40

70

Sound data

Ø

v (m/s)

Q (m³/h)

Lw [dB/Oct] - 100 Pa

Lw(A)

63Hz

125Hz

250Hz

500Hz

1kHz

2kHz

4kHz

8kHz

80

1.4

25

29

33

32

32

32

33

28

27

37

2.9

52

39

39

37

36

35

36

31

30

41

4.4

80

48

46

43

41

39

39

33

31

44

100

1.4

40

32

34

34

33

33

34

29

27

39

2.9

82

46

43

40

37

35

35

28

27

41

4.4

125

50

48

45

42

40

40

33

32

45

125

1.5

65

35

36

36

35

35

36

30

29

41

3.2

142

48

46

42

39

37

37

30

29

43

5

220

52

50

47

44

42

42

36

34

48

160

1.4

100

37

38

38

37

36

36

30

28

41

3.1

225

49

47

43

40

38

37

31

29

43

4.8

350

53

51

48

45

43

42

36

35

48

200

1.4

160

40

41

40

38

38

37

31

29

43

2.9

330

50

47

44

40

38

37

30

29

43

4.4

500

54

51

48

45

43

42

36

34

48

250

1.4

240

42

42

41

39

38

38

31

28

43

2.9

520

51

48

45

41

39

38

31

29

44

4.5

800

55

53

49

46

44

43

37

35

49

Ø

v (m/s)

Q (m³/h)

Lw [dB/Oct] - 250 Pa

Lw(A)

63Hz

125Hz

250Hz

500Hz

1kHz

2kHz

4kHz

8kHz

80

1.4

25

38

40

40

40

41

42

36

35

46

2.9

52

40

43

44

45

46

49

44

44

53

4.4

80

51

51

50

48

48

49

44

44

54

100

1.4

40

41

42

42

42

42

43

38

36

48

2.9

82

50

49

48

46

45

46

40

40

51

4.4

125

53

53

51

50

50

50

45

45

55

125

1.5

65

43

45

45

44

44

45

39

37

49

3.2

142

52

52

50

49

48

48

43

42

53

5

220

61

59

56

53

51

51

44

43

56

160

1.4

100

46

47

46

45

45

45

39

37

50

3.1

225

54

54

52

50

49

49

43

42

54

4.8

350

62

60

57

54

52

51

45

43

57

200

1.4

160

48

49

48

47

46

46

40

38

51

2.9

330

56

55

52

50

49

49

43

42

55

4.4

500

59

58

56

54

54

54

48

47

59

250

1.4

240

51

51

50

48

47

47

40

37

52

2.9

520

57

56

54

52

50

50

44

43

56

4.5

800

61

60

58

56

55

55

49

48

60

Ø

v (m/s)

Q (m³/h)

Lw [dB/Oct] - 500 Pa

Lw(A)

63Hz

125Hz

250Hz

500Hz

1kHz

2kHz

4kHz

8kHz

80

1.4

25

45

47

47

47

47

48

43

42

53

2.9

52

46

49

50

52

53

55

51

51

59

4.4

80

57

57

56

55

55

56

51

50

60

100

1.4

40

47

49

49

49

49

50

44

43

54

2.9

82

50

52

53

54

55

57

52

52

61

4.4

125

59

59

58

57

56

57

52

51

62

125

1.5

65

50

52

51

51

51

51

45

44

56

3.2

142

53

55

56

57

57

59

54

54

63

5

220

62

62

60

59

59

59

54

53

64

160

1.4

100

53

54

53

52

52

52

45

44

57

3.1

225

56

58

58

59

59

60

55

54

65

4.8

350

64

64

62

60

60

60

55

54

65

200

1.4

160

55

56

55

54

53

53

46

44

58

2.9

330

58

60

60

60

60

61

55

54

65

4.4

500

65

65

63

61

60

61

55

54

66

250

1.4

240

57

58

56

55

54

53

46

44

59

2.9

520

61

62

62

62

61

62

56

55

67

4.5

800

67

67

65

63

62

62

56

55

67

Symbols and specifications

Q [m³/h] = Air volume in m³/h

Ø = Duct diameter in mm

100Pa, 250Pa of 500Pa = Static pressure in Pa

Lw[dB/Oct] = Generated sound power in the duct divided into dB per octave band

Radiated sound data

Ø

ΔLw [dB/Oct] - non insulated duct

63Hz

125Hz

250Hz

500Hz

1kHz

2kHz

4kHz

8kHz

80

36

33

32

23

17

12

11

11

100

34

32

30

22

16

12

11

10

125

29

29

31

24

21

19

15

11

160

23

23

20

18

11

10

9

8

200

22

19

16

16

15

11

9

8

250

19

16

13

12

12

10

9

8

Ø

ΔLw [dB/Oct] - insulated duct (25mm)

63Hz

125Hz

250Hz

500Hz

1kHz

2kHz

4kHz

8kHz

80

39

35

39

35

32

33

34

29

100

38

35

38

34

31

33

34

28

125

35

33

37

36

32

33

36

27

160

27

26

28

29

27

31

31

25

200

23

18

23

26

29

29

29

24

250

23

18

20

24

26

30

28

24

Ø

ΔLw [dB/Oct] - insulated duct (50mm)

63Hz

125Hz

250Hz

500Hz

1kHz

2kHz

4kHz

8kHz

80

42

37

45

46

47

54

56

47

100

41

38

46

45

47

54

57

47

125

35

36

42

48

51

60

58

45

160

29

28

35

40

44

51

54

44

200

26

22

29

37

42

51

53

43

250

25

20

26

35

41

50

52

42

LW2 = LW - ΔLWLW2 = Case radiated noise in dB

LW = Sound power given for the frequencies f[Hz] from 63 up to 8000 Hz